Machine for grinding glass plates



W.,J. HERSCHEDE AND W. EBERHARDT.

MACHINE FOR GRINDING GLASS PLATES. APPLICATION FlLED MAY 18. 192021,401,698 Patented Dec. 27, 1921..

2 SHEETS-SHEET I. 54'

/ MMW w. 'J. HERSCHEDE AND w. EBERHARDT.

MACHINE FOB GRINDING GLASS PLATES.

APPLICATION FILED MAYI8, 1920. I

Patented Dec. 27, 1921.

2 SHEETS-SHEET 2- avwewtow IKACHINE FOR GRINDING GLASS PLATES.

menses.

Specification of Letters Patent. Patgnted Deg. 27 1921 Application filedMay 18, 1920. Serial 110.38%282. '5

To all whom it may concern: Be it known that we, WALTER J. HER- sonnnnand WV LTER EBERHARDT, citizens of the United States of America, andresidents of Cincinnati, in the county of Hamilton and State of Ohio,have invented a new and useful Improvement in a Machine for GrindingGlass Plates, of which the following is a specification. An object ofour invention is to provide a mechanical device thatwill automaticallygrind glass plates.

Another object of our invention is to pro: vide a device for the purposestated that will operate faster, and more accurately than devices usedheretofore.

Another object is to provide a device that will bevel oval pieces ofglass accurately andthat will not leave waves, in the bevel.

Another object is to prevent grooving of the grinds'tone.

These and other objects are attained by the means described herein anddisclosed in the accompanying drawing in which:

Figure 1 is a front elevation of a device embodying our invention.

Fig. 2 is an enlarged fragmental side view of a plate carriage, forminga detail of our invention.

Fig. 8 is an enlarged sectional view on line 3-3 of Fig. 1.

Fig. 4 is an enlarged sectional View on line el-d of Fig. 1.

Fig. 5 is an enlarged sectional view on line 5-5 of Fig. 1. p

Fig. 6 is an enlarged sectional view on line 6-6 of Fig. 1.

Fig. 7 isan inverted plan view, on a re duced scale, of a plate holderfor oval glass.

Our invention comprises a base A, upon which is revolved a grindstone a.The plate carriage B is supported above the base, and is slidablymounted upon the support bar D.

' The shaft Z) of the plate carriage is adapted to be revolved, at anangle to the grindstone a, whereby bevels of various angles may beground upon the plate of glass held upon the plate carriage.

The base A has a horizontalupper surface 4; upon which the grindstone ais revolved.

The brackets a and a are mounted upon the lugs a and a respectivelyformed on the base. The brackets support the bar D above the grindstonea.

The plate carriage B comprises a frame 5' supporting the hollow shaft 6.The cardisk 6 revolubly mounted upon disk 6 A guide sleeve Z2? is formedintegral with the disk 6?. The shaft 6 extends through the sleeve 5 andthe upper end 5 of the frame 6. At the upper end of the shaft b isattached a pipe b by means of which the air may be drawn-from theinterior of the shaft F) so as to create a vacuum for holding the glassupon the plate holder 6 A gear 6 is mounted upon the shaft 6 and isadapted to engage the drive gear 6 supported upon the drive shaft 6 Thedrive shaft Z) is supported by the frame. A drive pulley 6 s mountedupon the shaft 5 The block 6 is mounted upon the shaft 6 and hasa pin Z)extending downwardly parallel to the shaft 5. The block and pin areadjustable by means of the screws 6 and Z2 respectively. A section ofthe shaft 6, below the block Z) is screw threaded, and upon suchthreaded section are mounted the nuts I), b and the loose collar Z2Mounted upon the collar 6 and extending downwardly therefrom andparallel with the shaft 6 is the roller arm b supporting the roller 6The pattern-device Z2 is mounted upon the upper end of the sleeve Z) andis engaged by the roller 6 The lifting arm Z9 is slidably supported bythe sleeve 6 and extends downwardly parallel to shaft'b. Fingers forminga yoke upon the lower end of the lifting arm extend about the shaft 72and engage the lock nuts 6 and 19 mounted upon a threaded section of theshaft 6 above the plate holder 6 mounted on the bottom of the shaft 6.The vacuum plate holder 6 has a series of lugs 6 formed on its undersurface and interiorly to its rim 6 that 00- operate with the rim inholding the plate of chain 6 is inserted in any one of a series ofperforations Z2 formed in the frame 6, after moving the lever belowperforation, thereby holding the shaft and the vacuum plate fromcontacting the grinding stone. The cap I) seals the up )er end of theshaft 5.

The support bar D extends horizontally across the center of thegrindstone. The shaft (5 is mounted upon the bar D in vertical alinementWith the center of the grindstone a. A pulley d is mounted upon the haftd. The collar d is mounted upon the shaft (Z and limits the extent toWhich the shaft (Z extends through the bar D. Upon that part of theshaft cl extending through the bar D is mounted a disk (5 having adovetail formed on it. a dovetailed groove is mounted upon the disk andis adjustably attached to the disk by means of the screw d". The rod (Zis pivotally mounted upon the block d by means of the nut (Z and isattached to the sleeve 6 The operation of our de* ice is as follows:

The vacuum plate holder 6 is moved away from the grindstone a by meansof the lever 7). The lever is moved so that its end removed from thelifting arm Will be below one of the perforations b whereupon the pin 6.is inserted in the perforation. The pin prevents the return, of thelever to its normal position. is the lever is moved toward theperforations, it engages the liftingarm. The shaft 5 is moved upward because of the action of the lever upon the lifting itllrlWlllCll in turnengages the nut Z2 on the shaft 6. The gear Zflis conse quentlydisengaged from the gear 6 and the rotative motion of shaft Z) willcease. The disk 6 is'then adjusted upon the disk 6 until the shaft 7)will be at an angle to the grindstone that will give the desired angleto the bevel that is to be ground upon the plate. This adjustment ismade by loosen ing the bolts 34 and then revolving the disk F2 upon diskThe bolts are then tightened. A plateof glass is then placed inengagement with the plate holder and the air Withdrawn from theplateholder and the hollov. shaft 6 by means of the pipe 72, the

external air pressure retaining the plate upon the holder. The lever isreleased'by Withdrawing the pin Z) from the perforation 6 and the plateof glass is moved into'contact with the grindstone a, Whereupon theroller 71 is. adjusted to a distance from the pattern 5 equal to thedepth of the bevel that is to be ground upon the plate. The block andpin 5 support the collar Z andthe roller 9 and can be adjusted inconjunction with the roller arm to vary the depth of the bevel. Theshaft is then. released by completely releasing the lever, the gear 5engages the gear 6 and the grindstone operates upon the plate While Ablock (Z having neonees the drive gear revolves the shaft 6. If a roundplate of glass is to be beveled a pattern Z), having a straight upperedge, as shown in Fig. 3 by dotted line S, is used. If an oval plate isto be beveled, a pattern having the lobes as disclosed in the drawing,is used. The size of the lobes are varied in accordance with the shapeof the plate to be ground. As the roller 6 engages the lobes, the shaftF) Will be longitudinally reciprocated, thereby making it possible tosmoothly and accurately bevel an oval plate. The carriage B isreciprocated horizontally by means of the rod (Z and the eccentricmechanism mounted upon the shaft (Z. Motion is applied to the shaft clby means of the pulley (Z and to the. shaft 6 by means of the pulley bWhen the desired bevel is ground upon the glass plate, the roller 5 willcontinuously engage the pattern 5 and although the shaft may still berevolving, the plate Will be held out of engagement with the grindstone.By means of this contact between the roller and the pattern, a perfectbevel can be ground upon the glass plate. The plate holder is thenlifted by means of the lever 6 and the finished plate removed therefromby reducing the vacuum in the plate holder.

A machine embodying our invention and employing a polishing Wheel ordisk instead of the grindstone, can be used to polish the glass plates,and in view of any kind of grinding or polishing Wheel being equallyadaptable to be used in accordance with our disclosures, We do not limitour invention to a grindstone or polishing Wheel of specific functions.The face of the glass can be ground and polished as Well as can a bevelbe ground on the plate, by a device embodying our disclosures and We donot limit our invention to specific type of plate glass grinding.

What We claim is:

1. ln a machine for grinding bevels upon glass plates the combination ofa grindstone, a sleeve, means for mounting the sleeve ad jacent to thegrindstone, a shaft nounted reciprocally and rotatably in the sleeve, apattern mounted. upon the sleeve and a contact device secured upon theshaft and adapted to contact With the pattern device.

2. In a machine for grinding glass plates the combination of a'grindstone, a support a sleeve secured to the carriage, a shaft mountedreciprocally and rotatably in the sleeve, a plate holder mounted uponthe shaft, a pattern device carried by the sleeve, and a contact devicesecured to the shaft and adapted to engage the pattern.

4. in a machine for "rinding glass plates the combination of agrindstone, a support bar mounted adjacent to the grindstone, a carriagemounted reciprocally upon the support bar, a guide sleeve mountedadjustably upon the carriage, a shaft mounted revolubly and reciprocallyin the sleeve and a plate support mounted upon the shaft.

5. In a machine for grinding glass plates the combination of agrindstone, a support bar mounted adjacent to the grindstone and havingguide ways formed thereon, a carriage comprising disks revoluble inrelation to each other, one of the disks being mounted upon the ways, aguide sleeve secured to the other disk, a shaft mounted revolubly andreciprocally in the sleeve and a plate support upon the shaft.

6. In a machine for grinding bevels upon glass plates the combination ofa grindstone, a support bar mounted adjacent to the grindstone, waysformed upon the support bar, a carriage comprising disks revolubly inrelation to each other, one of the disks being mounted upon the ways, asleeve secured to the other dish, a pattern device secured upon theupper end of the sleeve, a shaft mounted revolubly and reciprocally inthe sleeve, a contact device secured to the shaft and adapted to contactwith the pattern device and a plate support secured upon the shaft.

7. In a machine for grinding glass plates the combination with agrindstone having a horizontal grinding face, of means to hold theplates, means to revolve the plate holding means, and means adapted tohorizontally reciprocate the plate holding means over the grinding face.

8. In a machine for grinding bevels upon glass plates the combinationwith a grindstone of means to hold a plate of glass, and means tolongitudinally reciprocate the plate holder, such reciprocating meanscomprising a revoluble shaft, a roller arm mounted upon the shaft, aroller supported by the roller arm and a fixed pattern device engagingthe roller.

9. In a machine for grinding glass plates, the combination of agrindstone, a plate holder, a driven shaft attached to the holder, agear upon the driven shaft, a frame reciprocally supporting the drivenshaft adjacent the grindstone, a drive shaft supported on the frame inparallelism with the driven shaft, and a gear upon the drive shaftadapted to engage the gear on the driven shaft. I

10. In a machine for grinding glass plates, the combination of agrindetone, a plate holder, a driven shaft attached-to the holder, agear upon the driven shaft, aframe reciprocally supporting the drivenshaft adjacent the grindstone, a drive shaft supported on the frame inparellelism with the driven shaft, a gear upon the drive shaft adaptedto engage the gear on the driven shaft, and means adapted to move thedriven shaft in the direction of its axis, whereby the gears may bemoved into engagement.

11. In a machine for grinding glass plates, the combination of agrindstone, a plate holder, and means to revolve the plate holder whenthe plate is in engagement with the grindstone and comprising a shaftattached to the holder, a frame supporting the shaft and upon which theshaft may be moved in the direction of its length, a revoluble driveshaft mounted on the frame in parallelism with the first mentionedshaft, and gears on the shafts adapted to engage when the firstmentioned shaft is moved to an operative position, wherein the glassgrindstone.

In witness whereof, we have hereunto subscribed our names this 14th dayof May,

WAL'IElEt J. HERSCHEDE. WALTER EBERHARDT.

